A computer would have been invaluable for this job.一台计算机对这个工作的作用会是无法估计的。The book is an invaluable aid to teachers of literature.这本书对于教授文学的老师来说帮助非常大。If you are a regular reader of Homes & Gardens you will know what an inv...
大气中含有70%以上的氮气.The atmosphere consist of more than 70 % of nitrogen.这只是对威尔逊氮气云室的一种改进.It was an adaptation of Wilson's cloud chamber, filled with nitrogen gas.采气管得用氮气吹扫.Sample gas tubes are flushed with nitrogen....
几百张卷紧的报纸在为数5万的人群中被点燃。Hundreds of tightly rolled newspapers were set aflame among the 50,000 crowd.这种产品看起来和点燃后都与常见的香烟没什么两样。The product looks and burns like a regular cigarette.查尔斯点燃了导火索，他们便赶紧四处躲避。Charles lit the fuses and...